Floating microbiological growth ball



FIG. 1 is a perspective view of a floating microbiological growth ball showing my new design;

FIG. 2 is a side elevational view thereof, all other sides being the same in appearance; and,

FIG. 3 is a top plan view thereof, the bottom being the same in appearance. 

CLAIM The ornamental design for a floating microbiological growth ball, as shown and described. 